Selectively operational cleaning tool

ABSTRACT

A downhole cleaning tool ( 10 ) for oil and gas wells. Brushes, scraper, wipers ( 32 ) and the like are mounted on a sleeve ( 14 ) over a tubular body ( 12 ), and the members successively moved towards and away from an inner surface of a tubular to be cleaned. Movement is created by a jarring action on the tool with the sleeve traveling over undulating profiles ( 26 ) on the body to actuate the cleaning members. The tool may be deployed on a slickline or wireline.

This patent application claims an international filing date 1 May 2003and a priority date of 4 May 2002. The present invention relates to wellcleaning apparatus and in particular, though not exclusively, to a wellcleaning tool which is selectively operational within the well bore.

It is considered desirable during drilling and production of oil and gasthat the walls of the tubing located within the well bore are kept cleanand free of deposits and debris. For this purpose, well cleaningapparatus is well known for use in the drilling and completion of wells.Such apparatus typically includes scrapers, wipers and/or brushes whichare held against the interior wall of the tubing to clean away debris asthe tool is run in and pulled out of the well bore.

The majority of these tools have the cleaning members i.e. the scrapers,wipers, brushes and the like, biased outwards to ensure contact with theinterior wall of the tubular. Such an arrangement has the disadvantagethat the cleaning members may become stuck and jam the tool within thewell bore requiring an expensive and time consuming fishing operation.

It would therefore be desirable to provide a cleaning tool which couldbe inserted into a well bore in a retracted or withdrawn position,expanded when required to provide cleaning at a desired location withina well bore and then retracted before removal from the well bore.

U.S. Pat. No. 2,216,674 discloses a well cleaner having pivotallymounted scraper blades. Selective operation of the blades is made bymovement of a linear actuator including a raised portion against theblades. A disadvantage of this tool is that the actuator must abut thebottom of the well to effect movement of the actuator, thus the locationand operation of the tool is limited.

U.S. Pat. No. 6,152,221 discloses a cleaning tool wherein the cleaningmembers are mounted on an expandable split sleeve. Radial movement ofthe cleaning members is achieved by movement of the sleeve on and/or offa shoulder on the mandrel. A disadvantage of this tool is thatmechanical or hydraulic means must be provided to the sleeve to effectselective movement on and off the shoulder. A further disadvantage ofthis tool is that the surface area of the cleaning members are limitedto the size of the portion of the sleeve which is expandable. As thecleaning members are mounted on the expandable sleeve the tool cannotachieve 360 degree cleaning of the tubular wall.

It is an object of the present invention to provide a cleaning toolwhich is selectively operational in a well bore and which obviates ormitigates at least some of the disadvantages of the prior art cleaningtools.

In particular, it is an object of the present invention to provide acleaning tool which is selectively operational in a well bore and whichdoes not require a hydraulic fluid feed to operate and does not requireto be set down in the well bore.

It is a further object of at least one embodiment of the presentinvention to provide a selectively operational cleaning tool which canbe deployed on a slickline or wireline.

It is a still further object of at least one embodiment of the presentinvention to provide a selectively operational cleaning tool which canbe used to clean tubing in producing wells.

According to a first aspect of the present invention there is provided aselectively operational cleaning tool for use in cleaning the innersurface of tubulars, the tool comprising:

a tubular body attachable to a work string;

a sleeve located around the tubular body;

a plurality of cleaning members positioned relative to the sleeve;

actuating means to successively move the cleaning members between aretracted position such that the cleaning members do not contact theinner surface of the tubular and an expanded position such that thecleaning members are held against the inner surface to effect cleaningthereof; and

a plurality of detachable coupling means between the body and thesleeve, to provide successive controlled movement of the sleeve and thebody with respect to each other and thereby operate the actuating means.

The tool therefore operates by sequentially decoupling the sleeve andthe body so that they move a fixed distance in relation to each other oneach decouplement. The relative movement sequentially moves the cleaningmembers between a retracted position and an expanded position. Thus thetool can repeatedly expand and retract the cleaning members in acontrolled manner.

According to a second aspect of the present invention there is provideda selectively variable cleaning tool for use in cleaning the innersurface of tubulars, the tool comprising:

a tubular body attachable to a work string;

a sleeve located around the tubular body;

a plurality of cleaning members positioned relative to the sleeve;

actuating means to move the cleaning members radially with respect tothe sleeve and thereby selectively vary the force exerted by thecleaning members on the inner surface of the tubular effect cleaningthereof; and

a plurality of detachable coupling means between the body and thesleeve, to provide successive controlled movement of the sleeve and thebody with respect to each other and thereby operate the actuating means.

It will be appreciated that the term ‘work string’ includes tubing inthe form of drill pipe, composites such as coiled tubing and cables,commonly referred to as slickline and wireline.

Preferably the sleeve includes a plurality of apertures through whichthe cleaning members may protrude. Preferably also each apertureincludes a lip to limit the maximum radial movement of each cleaningmember through the aperture.

Preferably the actuating mean comprises an undulating profilelongitudinal arranged on the outer surface of the body. Thus when thebody is moved, successive peaks and troughs of the profile locate at thecleaning members. Advantageously the sleeve and the body are arrangedsuch that a spring is located at each cleaning member to contact theundulating profile. Preferably the spring is a flat spring which may bereferred to as a linear expander. These springs operate through a smalllateral movement providing a comparatively large force. Thus when a peakis located at a cleaning member, the cleaning member is forced throughthe aperture to contact the wall of the tubular. Similarly when a troughis located at a cleaning member, the cleaning member retracts into thesleeve towards the body sway from the wall of the tubular. Alternativelythe troughs may be arranged so that the cleaning member remains incontact with the surface to be cleaned but now exerts a lower force onthe surface. Thus the pads can be fully engaged or partially engaged onthe surface of the tubular.

The use of a spring provides some flexibility on the pads so that theycan ride over inner diameter restrictions in the tubular such as nippleprofiles without jamming or sticking.

Preferably the detachable coupling means comprises a coupling memberattached to the body or sleeve via a shearing means. The shearing meansmay be a pin. Preferably also the sleeve or body includes a faceengageable with the coupling member such that force applied to thecoupling member on contact with the face causes detachment of thecoupling member by shearing of the shearing means. Preferably thecoupling member is a ring arranged on the outer surface of the body oron the inner surface of the sleeve. Advantageously the face comprises alip arranged on the inner surface of the sleeve or the outer surface ofthe body, respectively.

Preferably the tool further comprises a jar actuating sleeve and acorresponding lateral face. Preferably the jar actuating sleeve includesmeans for attachment to the work string. The means may provideattachment to a pipe, slickline, wireline, coiled tubing or the like.The lateral face may be located on a stop mounted upon the body. Furtherthe sleeve may enclose the stop. Movement of the jar actuator sleeveagainst the face provides a jarring action on the body, setting up ashock wave. The action can be repeated until sufficient force is exertedin the shock wave to cause shearing of one of the detachable couplings.

Preferably the tubular body is a mandrel. The tubular body may includean inner bore to provide a passage for fluid flow through the tool.

Advantageously the tool includes a damper or brake. The damper/brakeacts to prevent more than one detachable coupling being decoupled at atime.

Preferably the cleaning members are brushes, scrapers or the like whichremove debris when moved against the inner surface of the tubular.Advantageously the cleaning members are arranged to provide a pluralityof concentric cleaning pads longitudinally on the tool. Preferably also,the cleaning members are arranged to provide 360 degree, completecoverage of the outer surface of the sleeve so that the inner surface ofthe tubular is fully contacted if the tool is reciprocated in the wellbore.

According to a third aspect of the present invention there is provided amethod of cleaning the inner surface of a tubular located in a wellbore, the method comprising the steps:

-   -   (a) mounting a cleaning tool on a work string, the cleaning tool        including a plurality of cleaning members, the members being        actuable downhole to selectively move radially with respect to a        longitudinal axis of the tool;    -   (b) running the tool into the well bore; and    -   (c) creating a jarring action on the tool to actuate the        cleaning members and thereby vary the contact of the cleaning        members on the inner surface of the tubular.

In a preferred embodiment, the work string is a slickline. Alternativelythe work string may be pipe, coiled tubing, wireline or the like.

Preferably repetitive jarring actions are created to move the cleaningmembers a plurality of times within the well bore. The cleaning membersmay be moved such that they do not contact the inner surface of thetubular. Such movement would be advantageous if the tool became stuck inthe well bore. Advantageously the cleaning members may be moved to varythe force exerted by the members on the inner surface. Thus in anembodiment, the cleaning members may lightly compress the inner surfaceas the tool is run in the well bore, be actuated downhole to exert agreater force on the inner surface, and remain in this heavilycompressed position while the tool is pulled out of the well bore.

Preferably also the method may include the step of providing a brake ordamper within the tool to limit the effect of the jarring action.

Preferably also the method includes the step of collecting debrisremoved from thee inner surface of the tubular. The debris may becollected in a debris/junk catcher mounted below the tool on the workstring. Alternatively the debris may be collected by dislodging thedebris into a fluid path for return to the surface of the well bore.Preferably the fluid path is production fluid from the well. Thereforethe method may be used in live well bores during production.

An embodiment of the present invention will now be described, by way ofexample only, with reference to the following drawings of which:

FIG. 1 is a schematic cross-sectional view of a cleaning tool accordingto the present invention;

FIG. 2 is an expanded view of the actuating mechanism of the tool ofFIG. 1; and

FIG. 3 is an expanded view of the detachable coupling mechanism of thetool of FIG. 1.

Reference is initially made to FIG. 1 of the drawings which illustratesa cleaning tool, generally indicated by reference numeral 10, inaccordance with an embodiment of the present invention. Cleaning tool 10comprises a mandrel 12, a sleeve 14 mounted on the mandrel 12 includingcleaning pads 32, an actuating mechanism, generally indicated byreference numeral 16 and detachable coupling means, generally indicatedby reference numeral 18.

Mandrel 12 is shown as a rod; but could equally include a longitudinalbore for the passage of fluid internally through the tool 10. Mandrel 12includes at an upper end a stop 20 providing a face 21 facing downhole.Located around and enclosing the stop 20 is a jar actuator sleeve 22.The body 12 and stop 20 can move longitudinally with respect to thesleeve 22. Jar actuator sleeve 22 is attached to a work string (notshown). Such a string could be a pipe, slickline, wire line, coil tubingor the like. In the embodiment shown the preferred string would be aslickline.

Towards a base 24 of the mandrel 12, the outer surface of the mandrelincludes a surface profile 26 comprising an undulating arrangement ofpeaks 28 or plateaus and troughs 30. In the embodiment shown there arefour peaks and four troughs. The profile 26 is created by varying thediameter of the mandrel 12. Alternatively, the profile 26 could becreated by placing shoulders onto a mandrel.

Sleeve 14 is arranged over the profile 26 of the mandrel 12. Sleeve 14supports cleaning pads 32 arranged to clean the inner surface 34 of atubular 36. In the embodiment shown, three sets of pads 32 areillustrated and it will be understood that any number of sets could bearranged on the tool. Preferably each set of pads 32 are offset withrespect to each other in a rotational direction so that reciprocation ofthe tool 10 within the tubular 36 affects cleaning around the entirecircumference of the surface 34. In the preferred embodiment each set ofpads 32 are offset in a rotational direction from neighbouring sets by40 degrees. As shown in FIG. 1, the cleaning pads 32 may support anytype of cleaning apparatus and in the Figure shown they may be bristlesor brushes 38. Alternatively, they may be scrapers 40. Additionally, acombination of cleaning elements that can be used on the same tool 10.

The operation of the cleaning element 32 is best illustrated with theaid of FIG. 2. FIG. 2 shows the actuating mechanism 16 used in the tool10. Each cleaning pad 32 has a spring 44 attached to a back surface 42.Spring 44 is a linear expander, as is known in the art. These springsprovide a large force from a small movement of the spring. Spring 44 isattached to the pad 32 by means of a spring retainer 46 in the form of ascrew. Thus the spring 44, is held in place by the retainer 46, but maybe compressed or expanded depending on the distance between the back ofthe pad 42 and the surface of the undulating profile 26. In FIG. 2, itis illustrated that the spring 44 and pad 32 are located against atrough 30 of the mandrel 12. In this position, the pad 32 is held awayfrom the inner surface 34 of the tubular 36.

When the mandrel 12 is moved a distance indicated as ‘A’ on thedrawings, in either an upward or downward movement of the mandrel 12relative to the sleeve 14, a peak 28 of the profile 26 will be locatedat the spring 44 of the cleaning pad 32. Due to the available space, thespring 44 will be compressed by the profile 26 such that the pad 32 willmove radially outwards towards the inner surface 34 of the tubular 36.This movement will cause contact of the brushes 38 against the innerwall 34 and thus by movement of the tool 10, relative to the tubular 36by reciprocation or rotation, debris can be cleaned from the innersurface 34 of the tubular 36.

By moving the mandrel 12 a further distance equal to the distance marked‘A’, it can be seen that a subsequent trough 30A will now be located atthe spring 44 and pad 32, thereby causing the pad 32 to be retractedback towards the mandrel 12. Contact with the inner surface 34 of thetubular 36 is then prevented. It will be appreciated that any number ofconsecutive movements over a distance ‘A’ will cause the pads to beselectively expanded or retracted from the mandrel 12.

FIG. 2 also illustrates a cleaning pad 32A including a scraper 40. Inthis embodiment when the spring 44A is located in a trough 30B, thecleaning element 32A abuts the inner surface 34 with a light compressiveforce. When the mandrel 12 is relocated by a distance ‘A’, the forceexerted by spring 44A will increase the pressure exerted by the scrapers40 on the inner surface 34 of the tubular 36. This embodiment is usefulin that the tool may be run into the tubular 36 with the pads 32Alightly compressing the inner surface 34 of the tubular 36. Thisarrangement helps stabilise the tool as it is run into a well bore. Whenthe tool 10 is pulled from the bore the pads 32A can be heavilycompressed against the inner surface 34 of the tubular 36 such thatcleaning occurs as the tool is run out of the hole. It will beappreciated, that by merely placing different cleaning elements upon thepads 32, 32A, the amount of cleaning action effected by each pad uponthe inner surface 34 of the tubular 36 can be selected.

In order that the pad 32 remains within radial confinement to the sleeve14, there is arranged a first lip 48 at the edge of the aperture 50through which the cleaning pad 32 protrudes through the sleeve 14.Conversely, each pad 32 includes a second lip 52 which engages the firstlip 48 when the pads 32 are at the maximum radial distance of travelfrom the mandrel 12.

In order to move the mandrel 12 relative to the sleeve 14 by controlleddistances marked ‘A’ on FIG. 2, the detachable coupling mechanism 18, asillustrated in FIG. 3, is used.

Detachable coupling mechanism 18 comprises a housing 54, attached tosleeve 14. The attachment is by a threaded connection 56. Housing 54provides an enclosed space 58 around the mandrel 12. At an upper end ofthe housing 54, is provided a first abutment surface 60, while at lowerend is a complementary second abutment surface 62. The clearance 64between the housing 54 and the mandrel 12 is kept small. Located on themandrel 12 are a number of rings 66. The rings 66 are spaced apart bydistance equal to the distance ‘A’. Each ring 66, is held to the mandrelby a shearing means such as a bissel pin, 68. It will be appreciatedthat any number of bissel pins may be arranged between the rings 66 andthe mandrel 12. Also arranged on the mandrel 12 is a stop ring 70. Stopring 70 has a permanent attachment to the mandrel and may be formed asan integral part of the mandrel if required.

To detachably couple the mandrel 12 to the sleeve 14, a ring 66 locatesagainst the first abutment surface 60 of the housing 54. The ring 66 cansupport the weight of the sleeve as the tool 10 is carried into thewell. Pads 32 located in light compression against the inner surface 34of the tubular 36 may also provide support when the tool 10 is operatedfrom a wireline or slickline. To detach the coupling, a force isinserted upon the surface 60 such that the ring 66 abutting the surfaceis caused to shear from the mandrel 12. The shear is caused by thebreaking of the bissel pin 68. When the pin 68 is sheared, the ring 66becomes free from the mandrel 12 and thus drops and locates against anadjacent ring 66A. At the same time as the ring 66 drops, the housing 54and with it the sleeve 14 will move relative to the mandrel 12. Themandrel 12 and sleeve 14 will move by the relative distance ‘A’, therebyrelocating the peaks 28 and troughs 30 of the profile 26, behind thesprings 44 and the cleaning members 32. This process can be repeated bycreating a further jarring force at the surface 60 to shear the bisselpin 68A of the next ring. Thus, rings 66, 66A will now equivalently dropand with then the housing 54 and sleeve 14 will move once again adistance ‘A’ relative to the mandrel 12.

It will be appreciated that although only two rings 66, 66A are shown inthe FIG. 3, any number of rings may be located within the housing, 54.The distance between adjacent rings provides the distance on which thesleeve and mandrel will move with respect to each other. When the finalring 66A has been sheared, all rings will come to rest against the stopring 70.

A further feature of the decoupling mechanism 18 is a damper or break.The damper occurs as fluid or air is trapped within the enclosed space58. When the rings 66 and housing 54 move relative to the mandrel 12,the jarring action is prevented from causing multiple shearing ofconsecutive bissel pins 68, 68A by the dampening reaction from the airor fluid within the space 58. The air or fluid can slowly escape throughthe clearance 64, and this improves the dampening or braking effectbetween each movement of the mandrel/sleeve.

In use, tool 10 is attached to a string by attachment 20 and run into awell bore through tubular 36. As can be seen from FIG. 2 during run in,the pads 32 are preferentially located against a trough 30 of themandrel 12. In this position, the pads 32 may be arranged so that theyare not in contact with the inner surface 34 of the tubular 36 oralternatively, they may be in light compression on the inner surface 34.When the tool has reached a location in the well where cleaning is to beconducted, the work string is lowered and raised to cause the stop 20 tomove within the jar actuator sleeve 22. As a result the jar actuatorsleeve 22 is rammed against the face 21. This collision sets up a shockwave down the mandrel 12 to cause a jarring action at the surface 60within the coupling mechanism 18. The jarring action causes shearing ofa bissel pin 68 on a ring 66. When the ring 66 is sheared from themandrel 12, this allows movement of the mandrel 12 relative to thesleeve 14 over a fixed distance ‘A’ dictated by the distance betweenconsecutive rings located on the mandrel 12. This movement over a fixeddistance causes the troughs 30 to move away from the springs 44 causingpeaks or plateaus 28 to be located behind the springs 44. The springs 44are thereby compressed. This movement in a radial direction will cause astrong force to be exerted on the back surface 42 of the pads 32. Thepads 32 will therefore move radially from the mandrel, a distancelimited by the co-operation of first and second lips, 48, 52. Thecleaning pads 32 and in particular the brush 38 or a scraper 40 will becompressed onto the inner surface 34 of the tubular 36. Rotation orreciprocation of the tool 10, in the tubular 36 will affect cleaning ofthe inner surface 34 by the cleaning elements 38, 40 on the pads 32.

When the tool is to be retrieved from the well bore, if cleaning is notrequired during the removal of the tool, the jar actuator sleeve 22, canbe made to collide with a nut 20, again, to cause a jarring action. Thisaction will cause the subsequent shearing of a ring 66 from the mandrel12 to move the springs 44 into troughs 30 on the mandrel 12. In thisposition, the force on the cleaning pad 32 is reduced such that the pads32 may be retracted from the inner surface 34 of the tubular 36.

It will be appreciated by those skilled in the art that as the debris isdislodged from the inner surface 34 of the tubular 36, it may be caughtby a debris catcher or junk catcher on the tool 10 located below thebase 24.

Alternatively, in addition, the debris may be carried out of the well byfluid 72 located in the tubular 36. In a preferred embodiment the fluid72 is production fluid such that the debris may be carried out of a wellduring production.

A principal advantage of the present invention is that it provides acleaning tool giving repeatedly selective operation within a well bore.

A further advantage of the present invention is that it provides acleaning tool wherein the cleaning pads may be sufficiently retractedfrom the walls of the well bore so that the tool may be easily removedin cases where the tool or cleaning members could become jammed or stuckin the well bore.

A yet further advantage of the tool is that o-rings are not requiredwithin the construction as no seals are used thus removing a majorsource of failure in downhole tools.

A yet further advantage of the present invention is that it provides acleaning tool which may be run from a slickline or wireline so that itcan be inserted quickly into a well. In this regard, the tool may beadvantageously used within producing wells where the producing fluidwill help carry the debris dislodged from the inner walls, from thewell.

It will be appreciated by those skilled in the art that variousmodifications may be made to the invention herein disclosed withoutdeparting from the scope thereof. For example, the linear expandersprings could be replaced by a set of compressive springs attached tothe back surface of the cleaning pads. Further, the undulating profileon the mandrel could be arranged as a series of sloping sections suchthat the force applied on the cleaning pads could be made variable withrespect to their force on an inner wall of the tubular. Further, it willbe appreciated in the embodiment shown, the shearing means i.e. bisselpins were located on rings attached to the mandrel. Alternatively, theshearing means may be located between the housing and the rings.

1. A selectively operational cleaning tool for use in cleaning the innersurface of tubulars, the tool comprising: a tubular body attachable to awork string; a sleeve located around the tubular body; a plurality ofcleaning members positioned relative to the sleeve; actuating means tosuccessively move the cleaning members between a retracted position suchthat the cleaning members do not contact the inner surface of thetubular and an expanded position such that the cleaning members are heldagainst the inner surface to effect cleaning thereof; and a plurality ofdetachable coupling means between the body and sleeve, to providesuccessive controlled movement of the sleeve and the body with respectto each other and thereby operate the actuating means.
 2. A selectivelyvariable cleaning tool for use in cleaning the inner surface oftubulars, the tool comprising: a tubular body attachable to a workstring; a sleeve located around the tubular body; a plurality ofcleaning members positioned relative to the sleeve; actuating means tomove the cleaning members radially with respect to the sleeve andthereby selectively vary the force exerted by the cleaning members onthe inner surface of tubular effect cleaning thereof; and a plurality ofdetachable coupling means between the body and the sleeve, to providesuccessive controlled movement of the sleeve and the body with respectto each other and thereby operate the actuating means.
 3. A cleaningtool as claimed in claim 2 wherein the sleeve includes a plurality ofapertures through which the cleaning members protrude.
 4. A cleaningtool as claimed in claim 3 wherein each aperture includes a lip to limitthe maximum radial movement of each cleaning member through theaperture.
 5. A cleaning tool as claimed in claim 2 wherein the actuatingmeans comprises an undulating profile longitudinal arranged on an outersurface of the body.
 6. A cleaning tool as claimed in claim 5 whereinthe sleeve and the body are arranged with a spring located at eachcleaning member to contact the undulating profile.
 7. A cleaning tool asclaimed in claim 2 wherein the detachable coupling means comprises acoupling member attached to the body via a shearing means.
 8. A cleaningtool as claimed in claim 7 wherein the sleeve includes a face engageablewith the coupling member such that force applied to the coupling memberon contact with the face causes detachment of the coupling member byshearing of the shearing means.
 9. A cleaning tool as claimed in claim 8wherein the coupling member is a ring arranged on the outer surface ofthe body.
 10. A cleaning tool as claimed in claim 9 wherein the facecomprises a lip arranged on the inner surface of the sleeve.
 11. Acleaning tool as claimed in claim 2 wherein the detachable couplingmeans comprises a coupling member attached to the sleeve via a shearingmeans.
 12. A cleaning tool as claimed in claim 11 wherein the bodyincludes a face engageable with the coupling member such that forceapplied to the coupling member on contact with the face causesdetachment of the coupling member by shearing of the shearing means. 13.A cleaning tool as claimed in claim 12 wherein the coupling member is aring arranged on the inner surface of the sleeve.
 14. A cleaning tool asclaimed in claim 13 wherein the face comprises a lip arranged on theouter surface of the body.
 15. A cleaning tool as claimed in claim 2wherein the tool further comprises a jar actuating sleeve and acorresponding lateral face.
 16. A cleaning tool as claimed in claim 15wherein the jar actuating sleeve includes means for attachment to thework string.
 17. A cleaning tool as claimed in claim 16 wherein thelateral face is located on a stop mounted upon the body.
 18. A cleaningtool as claimed in claim 16 wherein the lateral face is located on stopmounted on the sleeve.
 19. A cleaning tool as claimed in claim 2 whereinthe tubular body includes an inner bore to provide a passage for fluidflow through the tool.
 20. A cleaning tool as claimed in claim 2 whereinthe tool includes a damper/brake.
 21. A cleaning tool as claimed inclaim 2 wherein the cleaning members are arranged to provide a pluralityof concentric cleaning pads longitudinally on the tool.
 22. A method ofcleaning the inner surface of a tubular located in a well bore, themethod comprising the steps: a) mounting a cleaning tool on a workstring, the cleaning tool including a plurality of cleaning members, themembers being actuable downhole to selectively move radially withrespect to a longitudinal axis of the tool; b) running the tool into thewell bore; and c) creating a jarring action on the tool to actuate thecleaning member and thereby vary the contact of the cleaning members onthe inner surface of the tubular.
 23. A method as claimed in claim 22wherein repetitive jarring actions are created to move the cleaningmembers a plurality of times within the well bore.
 24. A method asclaimed in claim 23 wherein the cleaning members are moved such thatthey do not contact the inner surface of the tubular.
 25. A method asclaimed in claim 23 wherein the cleaning members lightly compress theinner surface as the tool is run in the well bore, are actuated downholeto exert a greater force on the inner surface, and remain in thisheavily compressed position while the tool is pulled out of the wellbore.
 26. A method as claimed in claim 22 wherein the method includesthe step of providing a brake/damper within the tool to limit the effectof the jarring action.
 27. A method as claimed in claim 22 wherein themethod includes the step of collecting debris removed from the innersurface of the tubular.
 28. A method as claimed in claim 27 wherein thedebris is collected by dislodging the debris into a production fluidpath for return to the surface of the well bore.